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Re: x y coordinates of image pixels for an image outline

  • To: mathgroup at smc.vnet.net
  • Subject: [mg118114] Re: x y coordinates of image pixels for an image outline
  • From: Oliver Ruebenkoenig <ruebenko at wolfram.com>
  • Date: Tue, 12 Apr 2011 06:53:44 -0400 (EDT)

On Tue, 12 Apr 2011, william parr wrote:

> Dear Mathgroup,
>
> I think this problem is fairly straight forward, but I'm struggling with it!
>
> essentially, I want to;
> 1) determine/assign x y coordinate values to the black pixels in a binarised image.
> 2) select the outline black pixels (and get their x y coordinates) on each line of the image.
>
> This falls within a larger project of wanting to recover the outside 
> outline (ie surface outline with x y coordinates) of a bone from a CT 
> slice image. I would then probably aim to create a 3D point cloud for 
> the 
> external bone surface by assigning each slice a z coordinate value. 
> However, unless anyone has a very clever (ie not processor intensive) 
> way 
> of of creating a polygon mesh from the 3D point cloud, I will probably 
> export the point cloud for surface meshing in another program.
>
> thanks in advance,
>
> Will
>
>


Hi Will,

with that point cloud, you could use TetGenConvexHull to create a 3D 
surface and then use other TetGenLink` functionality to make a 
(refined/surface) mesh.

Hth,
Oliver


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